Matrix, a 15-month-old Belgian Malinois, looks back at his handler, Officer Joshua Robinson of the Yarmouth Police Department, while traversing an obstacle course during a demonstration following their graduation from police training in Vassalboro on Friday. Staff photo by Derek Davis

Matrix, a 15-month-old Belgian Malinois, looks back at his handler, Officer Joshua Robinson of the Yarmouth Police Department, while traversing an obstacle course during a demonstration following their graduation from police training in Vassalboro on Friday.